If he [the alcoholic] once gets able to pick out that way of conceiving, from all possible ways of conceiving the various opportunities which occur, if through thick and thin he holds to it that this is being a drunkard and is nothing else, he is not likely to remain one long. The effort by which he succeeds in keeping the right name unwaveringly present to his mind proves to be his saving moral act.
—William James, The Principles of Psychology, cited in Rollo May, Love and Will, pg 154